An optical, electrical and ultrasonic layered single sensor for ingredient measurement in liquid

作者：Kimoto A^*; Kitajima T

来源：Measurement Science and Technology, 2010, 21(3): 035204.

DOI：10.1088/0957-0233/21/3/035204

• optical property
• electrical property
• ultrasonic property
• PVDF film
• liquid

In this paper, an optical, electrical and ultrasonic layered single sensor is proposed as a new, non-invasive sensing method for the measurement of ingredients in liquid, particularly in the food industry. In the proposed sensor, the photo sensors and the PVDF films with the transparent conductive electrode are layered and the optical properties of the liquid are measured by a light emitting diode (LED) and a phototransistor (PT). In addition, the electrical properties are measured by indium tin oxide (ITO) film electrodes as the transparent conductive electrodes of PVDF films arranged on the surfaces of the LED and PT. Moreover, the ultrasonic properties are measured by PVDF films. Thus, the optical, electrical and ultrasonic properties in the same space of the liquid can be simultaneously measured at a single sensor. To test the sensor experimentally, three parameters of the liquid-such as concentrations of yellow color, sodium chloride (NaCl) and ethanol in distilled water-were estimated using the measurement values of the optical, electrical and ultrasonic properties obtained with the proposed sensor. The results suggested that it is possible to estimate the three ingredient concentrations in the same space of the liquid from the optical, electrical and ultrasonic properties measured by the proposed single sensor, although there are still some problems such as measurement accuracy that must be solved.

• 出版日期2010-3